#include<stdio.h>

void change(int *a, int *b)
{
	int tmp=*a;
	*a=*b;
	*b=tmp;
}

int main()
{
	int a=5,b=3;
	change(&a,&b);
	printf("num a=%d\nnum b=%d\n",a,b);
	return 0;
}
